/*
 * Copyright (C) 2005 - 2013 MaNGOS <http://www.getmangos.com/>
 *
 * Copyright (C) 2008 - 2013 Trinity <http://www.trinitycore.org/>
 *
 * Copyright (C) 2010 - 2013 ProjectSkyfire <http://www.projectskyfire.org/>
 *
 * Copyright (C) 2011 - 2013 ArkCORE <http://www.arkania.net/>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "MySQLConnection.h"
#include "QueryHolder.h"
#include "PreparedStatement.h"
#include "Log.h"

bool SQLQueryHolder::SetQuery(size_t index, const char *sql) {
    if (m_queries.size() <= index) {
        sLog->outError(
                "Query index (%zu) out of range (size: %u) for query: %s",
                index, (uint32) m_queries.size(), sql);
        return false;
    }

    /// not executed yet, just stored (it's not called a holder for nothing)
    SQLElementData element;
    element.type = SQL_ELEMENT_RAW;
    element.element.query = strdup(sql);

    SQLResultSetUnion result;
    result.qresult = NULL;

    m_queries[index] = SQLResultPair(element, result);
    return true;
}

bool SQLQueryHolder::SetPQuery(size_t index, const char *format, ...) {
    if (!format) {
        sLog->outError("Query (index: %zu) is empty.", index);
        return false;
    }

    va_list ap;
    char szQuery[MAX_QUERY_LEN];
    va_start(ap, format);
    int res = vsnprintf(szQuery, MAX_QUERY_LEN, format, ap);
    va_end(ap);

    if (res == -1) {
        sLog->outError("SQL Query truncated (and not execute) for format: %s",
                format);
        return false;
    }

    return SetQuery(index, szQuery);
}

bool SQLQueryHolder::SetPreparedQuery(size_t index, PreparedStatement* stmt) {
    if (m_queries.size() <= index) {
        sLog->outError(
                "Query index (%zu) out of range (size: %u) for prepared statement",
                index, (uint32) m_queries.size());
        return false;
    }

    /// not executed yet, just stored (it's not called a holder for nothing)
    SQLElementData element;
    element.type = SQL_ELEMENT_PREPARED;
    element.element.stmt = stmt;

    SQLResultSetUnion result;
    result.presult = NULL;

    m_queries[index] = SQLResultPair(element, result);
    return true;
}

QueryResult SQLQueryHolder::GetResult(size_t index) {
    // Don't call to this function if the index is of an ad-hoc statement
    if (index < m_queries.size()) {
        ResultSet* result = m_queries[index].second.qresult;
        if (!result || !result->GetRowCount())
            return QueryResult(NULL);

        result->NextRow();
        return QueryResult(result);
    } else
        return QueryResult(NULL);
}

PreparedQueryResult SQLQueryHolder::GetPreparedResult(size_t index) {
    // Don't call to this function if the index is of a prepared statement
    if (index < m_queries.size()) {
        PreparedResultSet* result = m_queries[index].second.presult;
        if (!result || !result->GetRowCount())
            return PreparedQueryResult(NULL);

        return PreparedQueryResult(result);
    } else
        return PreparedQueryResult(NULL);
}

void SQLQueryHolder::SetResult(size_t index, ResultSet* result) {
    /// store the result in the holder
    if (index < m_queries.size())
        m_queries[index].second.qresult = result;
}

void SQLQueryHolder::SetPreparedResult(size_t index,
        PreparedResultSet* result) {
    /// store the result in the holder
    if (index < m_queries.size())
        m_queries[index].second.presult = result;
}

SQLQueryHolder::~SQLQueryHolder() {
    for (size_t i = 0; i < m_queries.size(); i++) {
        /// if the result was never used, free the resources
        /// results used already (getresult called) are expected to be deleted
        if (SQLElementData* data = &m_queries[i].first) {
            switch (data->type) {
            case SQL_ELEMENT_RAW:
                free((void*) (const_cast<char*>(data->element.query)));
                break;
            case SQL_ELEMENT_PREPARED:
                delete data->element.stmt;
                break;
            }
        }
    }
}

void SQLQueryHolder::SetSize(size_t size) {
    /// to optimize push_back, reserve the number of queries about to be executed
    m_queries.resize(size);
}

bool SQLQueryHolderTask::Execute() {
    if (!m_holder)
        return false;

    /// we can do this, we are friends
    std::vector<SQLQueryHolder::SQLResultPair> &queries = m_holder->m_queries;

    for (size_t i = 0; i < queries.size(); i++) {
        /// execute all queries in the holder and pass the results
        if (SQLElementData* data = &queries[i].first) {
            switch (data->type) {
            case SQL_ELEMENT_RAW: {
                char const *sql = data->element.query;
                if (sql)
                    m_holder->SetResult(i, m_conn->Query(sql));
                break;
            }
            case SQL_ELEMENT_PREPARED: {
                PreparedStatement* stmt = data->element.stmt;
                if (stmt)
                    m_holder->SetPreparedResult(i, m_conn->Query(stmt));
                break;
            }
            }
        }
    }

    m_result.set(m_holder);
    return true;
}
